ANNUAL REPORT 2012

Compiled by:

Robert G. Deupree, Director

Florence Woolaver, ICA Assistant

Cover Image: Chris Geroux, Ph.D. student (see next page for caption)

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Front Cover Photo Caption

The interaction of radial pulsation and convection has been a long standing problem in stellar astrophysics. This interaction becomes especially important as convection strengthens as the effective temperature of RR Lyrae stars approaches the effective temperature of the "red edge" of the RR Lyrae instability strip from the hotter side. The "red edge" is the cool side of the region in temperature and luminosity space where RR Lyrae stars pulsate. Recent work by Marconi et al. (2007) showed that while a 1D time dependent mixing length theory approach works reasonably well for matching observed light curves of RR Lyrae much hotter than the red edge, it has difficulty reproducing light curve shape and amplitude simultaneously near the red edge, in particular for variable star v120 in M 3 (See figure 17 of Marconi et al. 2007, A&A, 474, 557 for their fit to this star's light curve).

The image shows the phased, observed light curve from Cacciari et al. (2005) for v120, doubled to show two cycles for easier comparison. It is matched by the small cyan points for a 6300 K effective temperature model. The model is two dimensional with 20 horizontal zones covering 6 degrees of the simulated star's surface. The model light curve points are from seven consecutive periods at fully amplitude which have been phased and doubled in the same manner as the observations. Bolometric corrections from Bessell et al. (1998) have been used to convert the models absolute bolometric magnitude to absolute visual magnitude and a distance modulus of 15.34 has been chosen to allow comparison with the apparent visual magnitude of the observed light curve. The small spread in the model light curve points indicates how well the pulsation cycles reproduce. In fitting the light curve only the phase shift and distance modulus were adjusted. We also did not perform a detailed parameter search to find the best fundamental model parameters for matching this light curve but rather used values representative of the cluster as a whole. The fit is a noticeable improvement over the 1D time dependent mixing length approach for this cool RR Lyrae star.

These results are based on a 2D hydrodynamic simulation with the SPHERLS code, which is being developed in the ICA by Ph.D. student Chris Geroux under the guidance of Dr. Robert Deupree, ICA Director.

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ICA Annual Report October, 2011 – September, 2012

Introduction

The ICA was created in late 2002 to promote the study of complex

astrophysical phenomena by numerical simulation. Throughout the past decade the

ICA has acquired access, through ACEnet and Compute Canada (in which several

ICA members have played very significant roles), to significant high performance

computing resources required for these simulations. In addition the ICA has

enriched the environment of the Department of Astronomy and Physics by hiring

ten postdoctoral fellows since its inception. A number of graduate students have

been part of the ICA, and to date eight MSc. degrees and three Ph. D. degrees have

been awarded to ICA students. Several more students are nearing completion of

their degree programs at both the MSc. and Ph. D. level. Currently ten of the

twelve graduate students in the Department of Astronomy and Physics MSc. and

Ph. D. programs have ICA faculty members as supervisors.

The ICA has six full time faculty members, each of whom is also a faculty

member in the Department of Astronomy and Physics. They are Dr. Robert

Deupree, Director and Tier 1 Canada Research Chair, Dr. David Clarke, Dr. David

Guenther, Dr. Marcin Sawicki, Dr. Ian Short, and Dr. Rob Thacker, Tier 2 Canada

Research Chair. Drs. Guenther, Short, and Sawicki were on sabbatical for at least

part of calendar year 2012. Two postdoctoral fellows, Dr. Fernando Peña and Dr.

Taro Sato, completed their terms. Dr. Peña obtained a postdoctoral position at

Dalhousie University performing mathematical calculations for medical research

and Dr. Sato returned to the USA. Ph. D. student Mr. David Williamson has taken

up a position in South Korea teaching English as a second language. Ph. D. student

Mr. Chris Geroux has taken up a postdoctoral position with Dr. Isabelle Baraffe at

the University of Exeter. Both will be defending their respective theses in January,

2013. Dr. Mike Casey, who completed his Ph. D. degree in the fall of 2011 and

chose to remain in Halifax for family reasons, has accepted a research position at

the Bedford Institute of Oceanography. Two Master’s students, Ms. Anneya Golob

and Mr. Diego Castañeda, are expected to defend their respective theses in

December 2012 or early January, 2013.

Ms. Florence Woolaver is completing her sixth year as the ICA

administrative assistant. Attached to the ICA are three ACEnet employees, Mr.

Stephen Condran, Mr. Phil Romkey and Dr. Sergiy Khan. Mr. Romkey is the

system administrator for the Mahone computer cluster, and Dr. Khan provides

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computational researchers with support on issues related to using the ACEnet

clusters. Dr. Khan’s background is in astrophysics, and he has helped a number of

ICA postdoctoral fellows and graduate students with specific code issues. Mr.

Condran arrived in early September and is the system manager for the Brasdor

cluster. Ms. Woolaver supplies administrative support to local ACEnet personnel

and acts as a key interface between SMU and the ACEnet administration in St.

John’s and between SMU and the ACEnet Chief Technology Officer located at

Saint Francis Xavier University.

Events in the Past Year

The ICA has organized two meetings on the SMU campus this year. In

October 2011 the annual national meeting of the technical support personnel of all

Compute Canada consortia was held at Saint Mary’s. Dr. Deupree opened the

meeting by welcoming the attendees and making some introductory remarks. In

July Saint Mary’s hosted an ACEnet sponsored introductory course in high level

computing (the “Software Carpentry Workshop”) given by Greg Wilson. Ms.

Woolaver provided the comparatively extensive administrative organizational

support required for both meetings. In addition, many ICA faculty and students

participated in the second ACEnet annual meeting (at Dalhousie; the first was at

Saint Mary’s last year) outlining the current state of affairs in ACEnet and

Compute Canada and the expectations for the next one or two years.

Dr. Thacker’s CRC Tier 2 position was renewed, and he received an

associated CFI award of approximately $90k in computer hardware. In addition,

Dr. Thacker is the Principal Investigator of a proposal to Compute Canada that was

awarded 2.5 million CPU hours on the WestGrid clusters.

The ICA hosted seven visitors for periods ranging from a few days to about

five weeks. Five of the visitors presented colloquia to the Department of

Astronomy and Physics weekly colloquium series.

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ICA Member Service

Members of the ICA play significant roles in service to the university, the

community, and to the astronomical community on both the national and

international scale. Here some of these activities are summarized.

Dr. Deupree continues to serve on the Advisory Board of the NRC’s

Herzberg Institute of Astrophysics. He is now in his second and final term and

brings his experience in high performance computing to the Board. He also serves

as a member of the ACEnet’s Chairs of the Local Users Group and is the Chair of

the Saint Mary’s Local Users Group. Dr. Deupree also served as the internal chair

of the external review of the Saint Mary’s Ph. D. program in Management.

Dr. Clarke serves on several university committees, including the Science

Curriculum and Science Space Committees. He also organized the Astronomy and

Physics Department’s Undergraduate Summer Research Mini-Symposium, which

included presentations by several ICA related undergraduate students.

Dr. Guenther is a member of the BRITE Constellation consortium. The

BRITE Constellation is a proposed set of six nano-satellites designed to observe

oscillations on the brightest stars in the sky. The project represents a joint

collaboration of Canadian, Polish, and Austrian asteroseismologists. The first four

satellites are scheduled for launch in 2012, with the two remaining (Canadian)

satellites to be launched in 2013. Guenther will contribute asteroseismic modeling

of red giants. Dr. Guenther also continues his collaborations with Dr. Kostanze

Zwintz (University of Vienna) on modelling the oscillation spectra of pre-main

sequence stars and with Dr. Thomas Kallinger (Belgium) on modelling the

oscillation spectra of red giants obtained by the CoRoT and MOST satellites. His

collaborations with the MOST Science Team and the Yale Convection Group

continue.

Dr. Sawicki continues to serve the profession in a number of ways.

Organizationally, he serves as the vice chair of the Association of Canadian

Universities for Research in Astronomy (ACURA) Board of Management and on

the Board of Directors of the Canadian Astronomical Society (CASCA). He is on

the Science Advisory Committees for the Canadian segment of the Canada-France-

Hawaii Telescope (CFHT), Gemini, and ALMA. Other service includes

membership on the Science Team for the TFI/NIRISS instrument being built by

Canada for the James Webb Space Telescope, being the PI of the Canadian Euclid

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Science Ground Segment Phase 0 study for the Canadian Space Agency (CSA),

and the Canadian collaboration contact for the JAXA sponsored WISH telescope

project. He is member of the Extragalactic Science Team for the next generation

CFHT project and of the Canadian Space telescope study team for the CSA.

Finally, he continues to demonstrate his commitment to the popularization of

astronomy through his participation of the Beyond IYA Committee.

Dr. Short continues to serve on the CASCA Awards and Education and

Public Outreach committees and has become the Saint Mary’s member of the

ACEnet Research Directorate. He also served on the time allocation committee for

the Canadian share of telescope time on the international offshore facilities of

which Canada is a part.

Dr. Thacker continues to serve as the head of the Astronomy and Physics

Department and as a member of the Canadian Astronomical Society’s (CASCA)

Implementation Committee for the Long Range Plan in Astronomy. He has also

served as a member of the time allocation committee for the Canadian share of

telescope time.

ICA Member Research Contributions

All of the ICA faculty members maintain very active research programs

involving not only themselves, but also postdoctoral fellows, graduate students,

and occasionally undergraduate summer researchers. All participate in publishing

papers, as well as serving as referees for various astrophysical journals. Here we

present a brief summary of ICA members’ research accomplishments for the past

year.

Dr. Deupree, along with postdoctoral fellow Dr. Fernando Peña, MSc.

student Diego Castañeda, and Dr. Ian Short, performed numerous calculations

related to the rapidly rotating, pulsating δ Scuti star, α Oph. Dr. Deupree first

computed evolutionary models which could match the observed oblateness,

approximate effective temperature, and a number of the oscillation frequencies of

the star. These results were not overly satisfactory from an intellectual point of

view because the models were not sufficiently constrained to allow conclusions

about the nature of α Oph. The research was then expanded to include computing

the spectral energy distribution of the models and comparing that the observed

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spectral energy distribution. This suggested that the original models had too high

effective temperatures. Further models were computed which did match the

observed spectral energy distribution and most of the observed oscillation

frequencies. All of the models to date had assumed uniform rotation, unlikely

given that the star is near the end of its core hydrogen burning phase. Dr. Deupree

and Mr. Castañeda computed three models with differential rotation which bridged

the region between uniform rotation and the rotation profile one would expect for a

model which locally conserved angular momentum. Spectral energy distributions

and line profiles were then computed from these models. These calculations show

that the results are not much changed from those of the uniformly rotating model.

This unfortunately implies that the observed information is probably not going to

be very useful in constraining the rotation law of stars of this sort.

Dr. Deupree and Mr. Castañeda also computed spectral energy distributions

for a large number of uniformly rotating Zero Age Main Sequence models

published last year by Dr. Deupree. In that work it was found that the surface

effective temperature, radius, and rotational velocity as functions of latitude were

scalable between two models as long as the surface shape remained the same (it is

implicit in this that the rotation law remains the same except for a scaling factor).

A study has begun to discover whether this means that the observable properties

one would deduce from the spectral energy distribution, such as the effective

temperature and luminosity, are scalable as well. Because these depend on the

inclination between the rotation axis and the observer, such scaling should aid in

isolating what models are appropriate for a given observed star.

Mr. Chris Geroux, supervised by Dr. Deupree, has completed his Ph. D.

research. He has performed a number of 1D, 2D, and 3D numerical simulations of

pulsating RR Lyrae stars. The multidimensional models allow convective motions

to be generated naturally in convectively unstable regions and enable the study of

the interaction of convection and stellar pulsation without resort to a

phenomenological approach to convection such as the local mixing length theory.

While the 3D calculations are more realistic, of course, the relationship between

convection and pulsation phase is nearly the same in both 2D and 3D calculations.

Convection significantly reduced the pulsational growth rates from the 1D (no

convection) calculations. The effect of convection on decreasing the pulsation

growth rates is only very slightly larger with the 3D models than the 2D models.

One of the main goals of the research was to be able to perform these multi-

dimensional calculations to full amplitude pulsation. This has been completed for

the 2D models with the result that the agreement for relatively blue fundamental

mode pulsator models, in which convection is relatively ineffective, is relatively

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good both with observations of RR Lyrae stars in M3 and with 1D mixing length

calculations performed by Marconi, et al. (ApJ, 596, 299). The RR Lyrae stars

chosen for a given model had nearly the same amplitude as the model, and the

temperatures were characteristically well within 100 K of those of the model. The

agreement with observations for models closer to the red edge is better than that

obtained with 1D mixing length full amplitude calculations, even though the

parameter space explored with the 1D calculations was appreciably larger than for

the 2D calculations. As one can imagine, the required computer time, even with

appreciable parallel processing, for the 3D calculations to reach full amplitude is

formidable, and the 3D full amplitude solutions will not be a part of the thesis.

They are expected to be completed sometime in the spring, 2013.

Dr. Clarke continues to work with Dr. Jon Ramsey, former ICA Ph. D.

recipient and current postdoctoral fellow at the University of Heidleberg, on papers

related to Jon’s thesis. This research investigated the relationship between the site

where protostellar jets are launched, and the much larger scale (by about five

orders of magnitude) where they are routinely observed. This entire range was

computed in one simulation. They have discovered a hitherto unknown relationship

between the jet’s advance speed and its rotation speed, the consequences of which

are currently being investigated. They also find that observable properties of the

jet, such as the advance speed, mass flux, and angular momentum are all related by

a power law to the strength of the magnetic field near the origin of the jet.

However, the jet radius and even the magnetic field strength in the large scale jet

are not strongly related to the magnetic field at the base of the jet; all jets appear to

evolve into a β ≈ 1plasma. Finally, a simple harmonic knot generator is established

near the launch site of the jet whose period is tightly coupled with the magnetic

field strength. For future, high-resolution observations, this may provide a means

by which the magnetic field strength can be measured.

Dr. Clarke is also working on a new numerical algorithm for his 3D

hydrodynamics code, ZEUS-3D. He has found algorithmic solutions to long-

standing issues with the main ZEUS-3D algorithm that prevented the code from

performing seemingly “simple” 2-D advection tests satisfactorily. The problem has

to do with the sequencing of the various sub-algorithms that make up the

“Consistent Method of Characteristics” (CMoC) algorithm used in the code since

1994 (Clarke, 1996, ApJ, 457, 291). It seems likely that with these modifications,

ZEUS-3D can be rendered fully second-order accurate and conservative in both

total energy (already implemented) and momentum (to be implemented) while still

maintaining its traditional staggered-mesh, non-Godunov approach.

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With Dr. Zwintz, Dr. Guenther is modeling current observations on pre-

main-sequence pulsating stars from the ground, MOST, and CoROT. Based on a

technique developed by Dr. Guenther’s Ph.D. student, Mr. Mike Casey, they have

been able to untangle the unique oscillation spectra of several types of pre-main-

sequence stars.

With Dr. Kallinger, Dr. Guenther is modeling the oscillation spectra of red

giant stars observed by CoRoT, Kepler, and MOST. Dr. Guenther contributed a

new method to compute directly the observable oscillation modes in red giants,

uncontaminated by the thousands of unobservable mixed modes.

Dr. Guenther is supervising his graduate student, Mr. Michael Gruberbauer

(an NSERC Vanier Fellowship holder), in developing Bayesian techniques to

determine corrections for non-specific surface layer effects on the oscillation

modes observed in stars. They published the techniques paper and our now

working on several application papers, including a detailed re-examination of the

oscillation spectrum of the Sun and its deduced age and composition.

Dr. Guenther has developed a combined pulsation and evolution computer

code (YJG). The code can compute pulsation spectra of models of evolving stars.

The code incorporates components from the Yale Rotating Evolution Code (Drs.

Demarque, Guenther, and Pinsonneault) and Dr. Guenther’s nonadiabatic,

nonradial stellar pulsation code. The updated code also includes new routines to

compute convective core overshoot using more realistic physics based on the

Kuhfuss treatment. With Professor Demarque (Yale) and graduate student Mr.

Michael Gruberbauer, they are exploring the effects of core overshoot on models

of Procyon.

Mr. Gruberbauer is also investigating surface effects in asteroseismology. He

has presented results of his research at several conferences including the Kepler

workshops. He has published one paper on his thesis work, with two more papers

in preparation.

Dr. Guenther supervised Ph.D. candidate Mr. Mike Casey. Mr. Casey

completed his studies of the seismic properties of pre-main sequence stars. He has

presented results of his research at several conferences, including the PMS

workshop, Vienna, and CASCA, London, Ontario and has a paper based on one of

the results of his thesis submitted to the MNRAS.

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Dr. Sawicki’s research interests are the formation and evolution of galaxies

in the distant universe. His research is on the observational side and he and

members of his research group use HPC to process and analyze large observational

datasets and carry out associated simulations. Under Sawicki’s supervision, Ms.

Liz Arcila-Osejo and Dr. Taro Sato have been using the Canada-France-Hawaii

Telescope Legacy Survey (CFHTLS) data to characterize the populations of

passively-evolving and actively-star-forming galaxies at redshift z~2; Ms. Anneya

Golob worked on the characterization of extreme, blue “BX galaxies” also at z~2;

and Mr. Robert Sorba is working on spatially-resolved spectral energy distribution

(SED) fitting of galaxy images. All these projects make extensive use of ACENet

computers. This year also saw the finalization of a paper on Sawicki’s “SEDfit”

software which forms the foundations of much of his and his group’s research, and

the delivery to NASA of JWST’s FGS/NIRISS instrument, on whose science team

Dr. Sawicki is a member. During the first half of 2012 much of Dr. Sawicki’s time

has been consumed by efforts to enable Canadian participation in the European-led

Euclid dark energy mission; while the Phase-0 study that he led was selected by

the Canadian Space Agency (CSA) as their top choice for Canadian participation

in Euclid, severe budget cuts suffered by the CSA this year put any such plans on

hold. In the second half of 2012 (and continuing into 2013) Dr. Sawicki was on

sabbatical research leave at Tohoku University in Sendai, Japan, to collaborate

with Dr. Toru Yamada and other staff members on the WISH space telescope

project and other endeavors.

Dr. Short, working with undergraduate students Mr. Eamonn Campbell and

Ms. Heather Pickup and collaborator Dr. Peter Hauschildt (Hamburger

Sternwarte), showed that computational models of red giant atmospheres and

spectra with hundreds of atomic opacity sources treated with the PHOENIX code

in more realistic non-local thermodynamic equilibrium (Non-LTE) leads to

effective temperatures inferred from spectral energy distributions (SEDs) that are

about 50 K cooler than those derived from the more common LTE modelling. Dr.

Short has extended his grid of NLTE models of late type giant stars be including

two competing solar abundance distributions (Grevesse and Sauval 1998

(“GS98”), used previously, and Grevesse, Asplund, Sauval, and Scott 2010

(“GASS10”)), and to include non-solar abundance distributions that include

enhancement of the alpha-process elements for the metal poor (1/3 solar

metallicity) grid. He has also increased the effective numerical resolution of the

SED grid by quadratic least-squares interpolation in the logarithmic flux to achieve

Delta Teff=25 K and Delta log(g)=0.25. Comparison to a special library of

observed SEDs for G8 to K4 III stars indicates that the adoption of the GASS10

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abundances lowers the inferred Teff by 25 to 50 K, in addition to the 50 – 75 K

reduction due to Non-LTE (NLTE) effects.

Dr. Short also worked with a sizeable array of collaborators to perform a

critical comparison of three of the world's leading stellar atmosphere and spectrum

synthesis codes, PHOENIX, MARCS, and ATLAS9, by performing a blind

experiment where groups using each of the three codes independently derived

stellar parameters from observed spectra of known stars of concealed identity. The

results show that there are still significant differences among these codes.

Dr. Short is working with MSc. student Mr. Mitch Young in combining 1D

model atmospheres to simulate 3D atmospheres with horizontal inhomogeneity in

the "1.5D" approximation to explore the biases introduced into stellar parameter

(both spectroscopic and photometric) determination with 1D models. This is

guided by recent results from 3D hydrodynamic simulations for select stars, but

can be applied to a much larger number of stars quickly. The unique feature of this

work will be an exploration of the degeneracy between 3D effects and NLTE

effects on parameter determination from fitting spectral energy distributions

(SEDs).

Mr. Chris Cooke, jointly supervised by Drs. Short and Guenther, is

investigating methods for interpolating the Rosseland-optical-depth versus

temperature relation among atmospheric models at canonical grid points in stellar

parameter space to determine how to best determine the upper boundary condition

needed for the calculation of asteroseismological modes of stellar structure models.

This will include an investigation of NLTE effects on the optical-depth versus

temperature relation and its significance for the predicted frequencies of

asteroseismological models.

Dr. Thacker is involved in a collaborative project lead by Dr. Diego Saez

(Universidad de Valencia, Spain) on weak lensing of the Cosmic Microwave

Background (CMB). Dr. Saez and collaborators developed a numerical analysis

tool for predicting the impact of weak lensing by foreground galaxy clusters on

measurements of the CMB. Dr. Thacker provided a parallel version of the

simulation code they have been using and together they are now running a series of

simulations to make predictions for the Planck satellite. The overall impact of

weak lensing on the CMB is actually comparatively small and restricted to small

scales (“high ℓ’s”); however, Planck will be the first space-borne experiment

capable of measuring the impact of weak lensing. The primary motivation for

making these measurements is that accurate estimation of cosmological parameters

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depends on being able to disentangle the impact of weak lensing on the primary

CMB signal.

Following publication of their first work in this field they are now

investigating the possibility of extending their work to investigate the impact of

physics on the CMB. In particular they are interested in further detailing the impact

of AGN on both lensing and the Sunyaev-Zel’dovich effect. This would be an

extension of previous work conducted in 2006, and would also be the most

advanced simulation of these effects to date.

Mr. James Wurster is just about finished with a paper on AGN feedback

algorithms. Both he and supervisor Dr. Thacker have presented this research at a

number of different conferences (Numerical Cosmology 2012, CASCA 2012

(Thacker), and Turbulence in Cosmic Structure (Arizona State University, March

2012, Wurster). In addition to this work he has also implemented a new feedback

algorithm which introduces a number of new features and we have begun an

informal collaboration with Dr. Frazer Pearce (U. Nottingham) on the details of

this.

Mr. Dave Williamson published his results on effective viscosities in galactic

disks due to molecular cloud collisions. This paper rectified a number of problems

in earlier analytic work (essentially predicting the time scale was far too long). He

presented this work at the turbulence conference in Arizona as well.

More recently Mr. Williamson has implemented models of subgrid

turbulence within the FLASH code to examine their impact on modelling gas

outflows due to star formation from galactic disks. These simulations are now

being written up. We have found that while these models show promise for

modelling the intracluster medium in galaxy clusters, they do not seem to be

appropriate for modelling the small scale variation in gas structure seen in

outflows. Mr. Williamson will be defending his Ph. D. thesis in early January when

he returns from Korea.

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Appendix 1: Publications and Talks of ICA Members

October 2011 – December 2012

Refereed Publications

Appourchaux, T., Benomar, O., Gruberbauer, M., Chaplin, W. J., García, R. A., Handberg, R., Verner, G. A., Antia, H. M., Campante, T. L., Davies, G. R., Deheuvels, S., Hekker, S., Howe, R., Salabert, D., Bedding, T. R., White, T. R., Houdek, G., Silva Aguirre, V., Elsworth, Y. P., van Cleve, J., Clarke, B. D., Hall, J. R., Kjeldsen, H., "Oscillation mode linewidths of main-sequence and subgiant stars observed by Kepler", 2012, A&A, 537A, 134

Appourchaux, T., Chaplin, W. J., Garcia, R. A., Gruberbauer, M., Verner, G. A., Antia, H. M., Benomar, O., Campante, T. L., Davies, G. R., Deheuvels, S., Handberg, R., Hekker, S., Howe, R., Régulo, C., Salabert, D., Bedding, T. R., White, T. R., Ballot, J., Mathur, S., Silva Aguirre, V., Elsworth, Y. P., Basu, S., Gilliland, R. L., Christensen-Dalsgaard, J., Kjeldsen, H., Uddin, K., Stumpe, M. C., Barclay, T., "Oscillation mode frequencies of 61 main-sequence and subgiant stars observed by Kepler", 2012, A&A, 543A, 54

Beck, P.G., Montalban, J., Kallinger, T., De Ridder, J., Aerts, C., Garcia, R.A., Hekker, S., Dupret, M.-A., Mosser, B., Eggenberger, P., Stello, D., Elsworth, Y., Frandsen, S., Carrier, F., Hille, M., Gruberbauer, M., Christensen-Dalsgaard, J., Miglio, A., Valentini, M., Bedding, T.R., Kjeldsen, H., Girouard, F.R., Hall, J.R., Ibrahim, K.A., "Fast core rotation in red-giant stars as revealed by gravity-dominated mixed modes", 2012, Nature, 481, 55

Brook, C. B.; Stinson, G. S.; Gibson, B. K.; Kawata, D.; House, E. L.; Miranda, M. S.; Macciò, A. V.; Pilkington, K.; Roškar, R.; Wadsley, J.; Quinn, T. R., “Thin disc, Thick Disc and Halo in a Simulated Galaxy”, 2012, MNRAS, 426, 690

Brook, C. B., Stinson, G. S., Gibson, B. K., Roskar, R., Wadsley, J. & Quinn, T., "Hierarchical Formation of Bulgeless Galaxies II: Redistribution of Angular Momentum via Galactic Fountains", 2012, MNRAS, 419, 771

Calura, F., Gibson, B. K., Michel-Dansac, L., Stinson, G. S., Pilkington, K., House, E. L., Brook, C. B. & Few, C. G., "The stellar metallicity distribution of disc galaxies and bulges in cosmological simulations", 2012, MNRAS, 427, 1401

Casey, M. P.; Zwintz, K.; Guenther, D. B.; Weiss, W. W.; Amado, P. J.; Díaz-Fraile, D.; Rodriguez, E.; Kuschnig, R.; Matthews, J. M.; Moffat, A. F. J.; Rowe, J. F.; Rucinski, S. M.; Sasselov, D., "MOST observations of the Herbig Ae δ-Scuti star HD 34282", 2012, MNRAS, tmp, 228

Côte, Patrick; Scott, Alan; Balogh, Michael; Buckingham, Ron; Aldridge, David; Carlberg, Ray; Chen, Weiguo; Dupuis, Jean; Evans, Clinton; Drissen, Laurent; Fraser, Wes; Grandmont, Frederic; Harrison, Paul; Hutchings, John; Kavelaars, JJ; Landry, John-Thomas; Lange, Christian; Laurin, Denis; Patel, Tarun; Pillay, Venka; Piche, Louis; Rader, Andres; Robert, Carmelle; Sawicki, Marchin; Sorba, Robert; Theriault, Guillaume; Van Waerbeke, Ludovic, “CASTOR: the Cosmological Advanced Survey Telescope for Optical and Ultraviolet Research”, 2012, SPIE, 8442E, 15

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David-Uraz, A, Moffat, A. F. J., Chené, André-Nicolas, Rowe, Jason F., Lange, Nicholas, Guenther, David B., Kuschnig, Rainer, Matthews, Jaymie M., Rucinski, Slavek M., Sasselov, Dimitar and Weiss, Werner W., “Using MOST to reveal the secrets of the mischievous Wolf-Rayet binary CV Ser”, 2012, MNRAS, 426, 1720

Deupree, R., "Theoretical p Mode Oscillation Frequencies for the Rapidly Rotating δ Scuti Star α Ophiuchi", 2011, ApJ, 742, 9

Deupree, Robert G., Castañeda, Diego, Peña, Fernando and Short, C. Ian, "Matching the Spectral Energy Distribution and p Mode Oscillation Frequencies of the Rapidly Rotating Delta Scuti Star α Ophiuchi with a 2D Rotating Stellar Model", 2012, ApJ, 753, 20

Doyon, René; Hutchings, John B.; Beaulieu, Mathilde; Albert, Loic; Lafrenière, David; Willott, Chris; Touahri, Driss; Rowlands, Neil; Maszkiewicz, Micheal; Fullerton, Alex W.; Volk, Kevin; Martel, André R.; Chayer, Pierre; Sivaramakrishnan, Anand; Abraham, Roberto; Ferrarese, Laura; Jayawardhana, Ray; Johnstone, Doug; Meyer, Michael; Pipher, Judith L.; Sawicki, Marcin, “The JWST Fine Guidance Sensor (FGS) and Near-Infrared Imager and Slitless Spectrograph (NIRISS)”, 2012, SPIE, 8442E, 2R

Dragomir, Diana; Matthews, Jaymie M.; Howard, Andrew W.; Antoci, Victoria; Henry, Gregory W.; Guenther, David B.; Johnson, John A.; Kuschnig, Rainer; Marcy, Geoffrey W.; Moffat, Anthony F. J.; Rowe, Jason F.; Rucinski, Slavek M.; Sasselov, Dimitar; Weiss, Werner W., "Non-detection of Previously Reported Transits of HD 97658b with MOST Photometry", 2012, ApJ, 759L, 41

Dragomir, Diana; Matthews, Jaymie M.; Kuschnig, Rainer; Rowe, Jason F.; Gladman, Brett J.; Guenther, David B.; Moffat, Anthony F. J.; Rucinski, Slavek M.; Sasselov, Dimitar; Weiss, Werner W., "A Search for Transits of GJ 581e and Characterization of the Host Star Variability Using MOST Space Telescope Photometry", 2012, ApJ, 759, 2

Dressler, A., Martin, C.L., Henry, A., Sawicki, M. & McCarthy, P., "Detections of Faint Ly-α Emitters at z=5.75: Galaxy Building Blocks and Engines of Reionization", 2011, ApJ, 740, 71

Ferrarese, Laura; Côté, Patrick; Cuillandre, Jean-Charles; Gwyn, S. D. J.; Peng, Eric W.; MacArthur, Lauren A.; Duc, Pierre-Alain; Boselli, A.; Mei, Simona; Erben, Thomas; McConnachie, Alan W.; Durrell, Patrick R.; Mihos, J. Christopher; Jordán, Andrés; Lançon, Ariane; Puzia, Thomas H.; Emsellem, Eric; Balogh, Michael L.; Blakeslee, John P.; van Waerbeke, Ludovic; Gavazzi, Raphaël; Vollmer, Bernd; Kavelaars, J. J.; Woods, David; Ball, Nicholas M.; Boissier, S.; Courteau, Stéphane; Ferriere, E.; Gavazzi, G.; Hildebrandt, Hendrik; Hudelot, P.; Huertas-Company, M.; Liu, Chengze; McLaughlin, Dean; Mellier, Y.; Milkeraitis, Martha; Schade, David; Balkowski, Chantal; Bournaud, Frédéric; Carlberg, R. G.; Chapman, S. C.; Hoekstra, Henk; Peng, Chien; Sawicki, Marcin; Simard, Luc; Taylor, James E.; Tully, R. Brent; van Driel, Wim; Wilson, Christine D.; Burdullis, Todd; Mahoney, Billy; Manset, Nadine, “The Next Generation Virgo Cluster Survey. I. Introduction to the Survey”, 2012, ApJS, 200, 4

Few, C. G., Courty, S., Gibson, B. K., Kawata, D., Calura, F. & Teyssier, R., "RAMSES-CH: A New Chemodynamical Code for Cosmological Simulations", 2012, MNRAS, 424L, 11

Fullana i Alfonso, Màrius Josep; Arnau i Córdoba, Josep Vicent; Thacker, Robert J.; Couchman, Hugh M. P.; Sáez, Diego P., "Observations and simulations of the CMB temperature anisotropy at very small angular scales", 2012, AIPC, 1446, 252

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Gruber, D.; Saio, H.; Kuschnig, R.; Fossati, L.; Handler, G.; Zwintz, K.; Weiss, W. W.; Matthews, J. M.; Guenther, D. B.; Moffat, A. F. J.; Rucinski, S. M.; Sasselov, D., “New slowly pulsating B stars in the field of the young open cluster NGC 2244 discovered by the MOST photometric satellite”, 2012, MNRAS, 420, 291

Gruberbauer, M., Guenther, D. B., Kallinger, T., "Toward a New Kind of Asteroseismic Grid Fitting", 2012, ApJ, 749, 109

Grunhut, J.H., Rivinius, Th., Wade, G.A., Townsend, R.H.D., Marcolino, W.L.F., Bohlender, D.A., Szeifert, Th., Petit, V., Matthews, J.M., Rowe, J.F., Moffat, A.F.J., Kallinger, T., Kuschnig, R., Guenther, B.D., Rucinski, S.M., Sasselov, D., Weiss, W.W., the MiMeS Collaboration, "HR 5907: Discovery of the most rapidly rotating magnetic B-type star by the MiMeS Collaboration", 2011, MNRAS, 419, 1610

Grupe, D., Komossa, S., Gallo, L. C., Longinotti, A. L., Fabian, A. C., Pradhan, A. K., Gruberbauer, M., Xu, D., "A remarkable long-term light curve, and deep, low-state spectroscopy: Swift & XMM-Newton monitoring of the NLS1 galaxy Mkn 335", 2012, ApJS, 199, 28

Hatzes, A. P.; Zechmeister, M.; Matthews, J.; Kuschnig, R.; Walker, G. A. H.; Döllinger, M.; Guenther, D. B.; Moffat, A. F. J.; Rucinski, S. M.; Sasselov, D.; Weiss, W. W., “The mass of the planet-hosting giant star β Geminorum determined from its p-mode oscillation spectrum”, 2012, A&A, 543, 98

Henry, A.L., Martin, C.L., Dressler, A., Sawicki, M., & McCarthy, P., “The Faint-end Slope of the Redshift 5.7 Lyα Luminosity Function”, 2012, ApJ, 744, 149

Kallinger, T., Hekker, S., Mosser, B., De Ridder, J., Bedding, T. R., Elsworth, Y. P., Gruberbauer, M., Guenther, D. B., Stello, D., Basu, S., Garcia, R. A.,Chaplin, W. J., Mullally, F., Still, M., Thompson, S. E., "Evolutionary influences on the structure of red-giant acoustic oscillation spectra from 600d of Kepler observations", 2012, A&A, 541A, 51

Kallinger, T.; Matthews, J. M.; Guenther, D. B.; Gruberbauer, M.; Kuschnig, R.; Weiss, W. W.;

MOST Team, "ɛ Ophiuchi: Revisiting a Red Giant", 2012, ASPC, 462, 156 Kurtz, D. W.; Cunha, M. S.; Saio, H.; Bigot, L.; Balona, L. A.; Elkin, V. G.; Shibahashi, H.; Brandão,

I. M.; Uytterhoeven, K.: Frandsen, S.; Frimann, S.; Hatzes, A.; Lueftinger, T.; Gruberbauer, M.; Kjeldsen, H.; Christensen-Dalsgaard, J.; Kawaler, S. D., “The First Evidence for Multiple Pulsation Axes: A New roAp Star in the Kepler Field, KIC 10195926”, 2012, ASPC, 462, 125

Lebzelter, T., Heiter, U., Abia, C., Eriksson, K., Ireland, M., Neilson, H., Nowotny, W., Merle, T., Mora, A., Peterson, R., Plez, B., Short, C. I., Wahlgren, G., Worley, C., Aringer, B., Bladh, S., Goswami, A., Maldonado, J., Neyskens, P., Norris, R., Th´evenin, F., Tsuji, T., van Eck, S. and Wing, R. F., "Comparative Modelling of the Spectra of Cool Giants", 2012, A&A, 547, 108

Lovekin, Catherine, Deupree, Robert G., "Mass loss in 2D rotating stellar models", 2011, IAUS, 272, 93

Macciò, A. V.; Stinson, G.; Brook, C. B.; Wadsley, J.; Couchman, H. M. P.; Shen, S.; Gibson, B. K.; Quinn, T., "Halo Expansion in Cosmological Hydro Simulations: Toward a Baryonic Solution of the Cusp/Core Problem in Massive Spirals", 2012, ApJ, 744, 9

Pascual-Granado, J.; Grigahcène, A.; Díaz-Fraile, D.; Gruberbauer, M.; Garrido, R.; Amado, P.; Suárez, J. C., "On the Origin of the Dense Frequency Spectra of Space Observed Intermediate Mass Pulsating Stars”, 2013, ASSP, 31, 33

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Pilkington, K., Few, C. G., Gibson, B. K., Calura, F., Michel-Dansac, L., Molla, M., Matteucci, F., Rahimi, A., Kawata, D., Thacker, R. J., Brook, C. B. & Stinson, G. S., "Metallicity Gradients in Disks: Do Galaxies Form Inside-Out?", 2012, A&A, 540A, 56

Pilkington, K.; Gibson, B. K.; Brook, C. B.; Calura, F.; Stinson, G. S.; Thacker, R. J.; Michel-Dansac, L.; Bailin, J.; Couchman, H. M. P.; Wadsley, J.; Quinn, T. R.; Maccio, A., "The Distribution of Metals in Cosmological Hydrodynamical Simulations of Dwarf Disc Galaxies", 2012, MNRAS, 425, 969

Pisano, D. J., Barnes, D. G., Staveley-Smith, L., Gibson, B. K., Kilborn, V. A. & Freeman, K. C., "An HI Survey of Six Local Group Analogs. II. HI Properties of Group Galaxies", 2011, ApJS, 197, 28

Ramsey, Jon P., Clarke, David A. & Men’shchikov, Alexander B., “AZEuS: An Adaptive Zone Eulerian Scheme for Computational MHD”, 2012, ApJS, 199, 13

Ruchti, Gregory R.; Fulbright, Jon P.; Wyse, Rosemary F. G.; Gilmore, Gerard F.; Grebel, Eva K.; Bienaymé, Olivier; Bland-Hawthorn, Joss; Freeman, Ken C.; Gibson, Brad K.; Munari, Ulisse; Navarro, Julio F.; Parker, Quentin A.; Reid, Warren; Seabroke, George M.; Siebert, Arnaud; Siviero, Alessandro; Steinmetz, Matthias; Watson, Fred G.; Williams, Mary; Zwitter, Tomaz, "Metal-poor Lithium-rich Giants in the Radial Velocity Experiment Survey", 2011, ApJ, 743, 107

Saio, H., Gruberbauer, M., Weiss, W.W., Matthews, J.M., Ryabchikova, T., "Pulsation models for the roAp star HD 134214", 2012, MNRAS, 420, 283

Sanchez-Blazquez, P., Marcolini, A., Gibson, B. K., Karakas, A. I., Pilkington, K. & Calura, F., "The Chemical Evolution of Globular Clusters - II. Metals and Fluorine", 2012, MNRAS, 419, 1376

Savoy, J., Sawicki, M., Thompson, D., & Sato, T., "Keck Deep Fields. IV. The Mass-Dependent Clustering of UV-Selected Galaxies at z~4, 3, and 2", 2011, ApJ, 737, 92

Sawicki, M., "SEDfit: Software for Spectral Energy Distribution Fitting of Photometric Data", 2012, PASP, 124, 1208

Sawicki, M., "Stars, Dust, and the Growth of UV-Selected Sub-L* Galaxies at Redshift z~2", 2012, MNRAS, 421, 2187

Sawicki, Marcin, "The Build-up of Mass in UV-Selected Sub-L* Galaxies at z~2", 2011, IAUS, 277, 287

Short, C. Ian; Campbell, Eamonn A.; Pickup, Heather; Hauschildt, Peter H., "Modeling the near-UV Band of GK Stars. II. Non-LTE Models", 2012, ApJ, 747, 143

Short, C. Ian and Hauschildt, P. H., "CoolGrid: Modelling the right half of the Hertzsprung-Russell Diagram", 2011, ASPC, 445,173

Snaith, O. N., Gibson, B. K., Brook, C. B., Knebe, A. & Thacker, R. J., "The Halo Shape and Evolution of Polar Disc Galaxies", 2012, MNRAS, 425, 1967

Sorba, R. & Sawicki, M., "How Future Space-Based Weak Lensing Surveys Might Obtain Photometric Redshifts Independently", 2011, PASP, 123, 777

Stinson, Greg; Brook, Chris; Prochaska, J. Xavier; Hennawi, Joe; Pontzen, Andrew; Shen, Sijing; Wadsley, James; Couchman, Hugh; Quinn, Tom; Macciò, Andrea V.; Gibson, Brad K., "MAGICC haloes: confronting simulations with observations of the circumgalactic medium at z=0", 2012, MNRAS, 425, 1270

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Turner, D. G.; Moncrieff, K.; Short, C. I.; Wing, R. F.; Henden, A. A., "AAVSO Estimates and the Nature of Type C Semiregulars: Progenitors of Type II Supernovae", 2012, JAVSO, 40Q, 415

Uytterhoeven, K., Moya, A., Grigahcene, A., Guzik, J.A., Gutierrez-Soto, J., Smalley, B., Handler, G., Balona, L., Niemczura, E., Fox Machado, L., Benatti, S, Chapellier, E., Tkachenko, A., Szabo, R., Suarez, J.C., Ripepi, V., Pascual, J., Mathias, P., Martin-Ruiz, S., Lehmann, H., Jackiewicz, J., Hekker, S., Gruberbauer, M., Garcia., R.A., Dumusque, X., Diaz-Fraile, D., Bradley, P., Antoci, V., Roth, M., Leroy, B., Murphy, S.J., De Cat, P., Cuypers, J., Kjeldsen, H., Christensen-Dalsgaard, J., Breger, M., Pigulski, A., Kiss, L.L, Still, M., Thompson, S.E., van Cleve, J., "The Kepler characterization of the variability among A- and F-type stars. I. General overview", 2011, MNRAS, 534, 125

White, Timothy R., Bedding, Timothy R., Gruberbauer, Michael, Benomar, Othman, Stello, Dennis, Appourchaux, Thierry, Chaplin, William J., Christensen-Dalsgaard, Jørgen, Elsworth, Yvonne P., García, Rafael A., Hekker, Saskia, Huber, Daniel, Kjeldsen, Hans, Mosser, Benoît, Kinemuchi, Karen, Mullally, Fergal, Still, Martin, "Solving the mode identification problem in asteroseismology of F stars observed with Kepler", 2012, ApJL, 751L, 36

Williamson, D., & Thacker, R. J., "Effective viscosity from cloud-cloud collisions in global galaxy simulations", 2012, MNRAS, 421, 2170

Zwintz, K., Lenz, P., Breger, M., Pamyantnykh, A. A., Zdravkov, T., Kuschnig, R., Matthews, J. M., Guenther, D. B., Moffat, A. F. J., Rowe, J. F., Rucinski, S. M., Sasselov, D., Werner, W. W., "Regular frequency patterns in the classical delta Scuti star HD 144277 observed by the MOST satellite”, 2011, A&A, 533, 133

Papers Submitted to Refereed Journals Arcila-Osejo, L., Sawicki, M. & Sato, T., "Luminosity function of z~2 galaxies from 2.5 square

degrees of CFHT imaging", 2012, in preparation Few, C. G., Courty, S., Gibson, B. K., Brook, C. B., Stinson, G. S. & Michel-Dansac, L., "RaDES:

RAMSES Disk Environment Study", 2012, A&A, submitted Sato, T. & Sawicki, M., "Angular clustering of z~2 galaxies in 2.5 square degrees of CFHT

imaging", 2012, in preparation Sorba, R. & Sawicki, M., "On the stellar masses of high-redshift galaxies", 2012, in preparation

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Colloquia and Presentations Given by ICA Members

Dr. Robert Deupree, Los Alamos Stellar Hydrodynamics Workshop, Santa Fe, NM, "Computational Methods for the Evolution and Hydrodynamics of Rotating Stars", 2-4 April 2012

Mr. Chris Geroux, Los Alamos Stellar Hydrodynamics Workshop, Santa Fe, NM, "3D Simulations of Convection-Pulsation Interaction in RR Lyrae Stars", 2-4 April 2012

Dr. Ian Short, Mt. Allison University, Sackville, NB, “Non-LTE modelling of Red Giant Spectra”, 4 November 2011

Dr. Ian Short, Saint Mary's University, "Computational Modelling of Red Giant Spectra: Non-LTE vs LTE", 18 November 2011

Dr. Robert Thacker, Numerical Cosmology 2012 Workshop, University of Cambridge UK, “A Comparative Study of AGN Feedback Models”, 17-20 July 2012

Dr. Robert Thacker, Monash University, Melbourne, Australia, “Skeletons in the AGN modelling cupboard”, April 2012

Dr. Robert Thacker, Swinburne University, Melbourne, Australia, “Skeletons in the AGN modelling cupboard”, April 2012

Mr. Dave Williamson, Saint Mary's University, "Do collisions between molecular clouds make a significant difference on a galactic scale?", 25 November 2011

Contributed Poster Papers

C. Ian Short, “Modeling the near-UV band of GK stars: NLTE models”, Cool Stars 17, Barcelona, 24-28 June 2012